"Kind of like a stabbing feeling, kind of like there's something in my eye," Gasho said.

After getting it checked, Gasho was diagnosed with Acanthamoeba Keratitis, or AK.

Wills Eye Doctor Christopher Rapuano says AK is a parasitic infection caused by an amoeba found in all kinds of water.

"It's all over. It's in regular tap water, pool water, the ocean, it's really all over the place," Rapuano said.The infection is rare, but can be serious and lead to permanent vision loss. People who wear contact lenses are the most at risk, especially those who don't follow the recommended care instructions.

"Things like not cleaning contact lenses properly, sleeping in contacts is a big no, no. Swimming in contacts is a big no, no. Showering with them is not great either," said Dr. Rapuano.

He says sleeping in contacts can create microscopic scratches on the cornea that makes you susceptible to all kinds of eye infections.

It's still a long road to recovery for Gasho. Dr. Rapuano says it takes months of treatment, hoping to prevent scarring and restore vision.

"Just to get my eye open and seeing a little, I hope comes about," said Gasho.The treatment is difficult as well. In the beginning, patients need to instill eye drops every hour.

But again, this infection is rare. Most contact lens-wearers won't get it, but it's important to follow the guidelines to lower your risk.